Mechanical Engineering Mcqs

A. it allows maximum compression to be achieved
B. it greatly affects volumetric efficiency
C. it results in minimum work
D. it permits isothermal compression
E. none of the above

A. compressor efficiency
B. isothermal efficiency
C. volumetric efficiency
D. mechanical efficiency
E. adiabatic efficiency

A. centrifugal compressor
B. axial compressor
C. pumps
D. all of the above
E. none of the above

A. Power consumption per unit of air delivered is low
B. Volumetric efficiency is high
C. It is best suited for compression ratios around 7:1
D. The moisture in air is condensed in the intercooler
E. Outlet temperature is reduced

A. from an air conditioned room maintained at 20°C
B. from outside atmosphere at 1°C
C. from coal yard side
D. from a side where cooling tower is located nearby
E. from any one of the above locations

A. increases with increase in compression ratio
B. decreases with increase in compression ratio
C. in not dependent upon compression ratio
D. may increase/decrease depending on compressor capacity
E. unpredictable

A. to accommedate Valves in the cylinder head
B. to provide cushioning effect
C. to attain high volumetric efficiency
D. to avoid mechanical bang of piston with cylinder head
E. to provide cushioning effect and also to avoid mechanical bang of piston with cylinder head

A. increases
B. decreases
C. remains same
D. increases/decreases depending on com-pressor capacity
E. unpredictable

A. compression index
B. compression ratio
C. compressor efficiency
D. mean effective pressure
E. compressor effectiveness

A. gauge discharge pressure to the gauge intake pressure
B. absolute discharge pressure to the ab-solute intake pressure
C. pressures at discharge and suction cor-responding to same temperature
D. stroke volume and clearance volume
E. none of the above